Special tools required:

WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, and 2001 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.

00 3 520
00 3 580
(cylinder head dismantled)

Machine valve seat surface with special tool 00 3 520 or with special tool 00 3 580 in accordance with manufacturer's instructions.

Fig 1: Machining Valve Seat Surface With Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: After machining the valve seat surface, remachine the outside and inside diameters with a correction milling tool to the pre-specified diameter to produce valve seat width (5).

Fig 2: Identifying Dimensions Of Valve Seat

Courtesy of BMW OF NORTH AMERICA, INC.

Valve-seat angle
Correction angle, outside
Correction angle, inside
Outside diameter seat face
Valve-seat width

Specified values (1 to 5).